Marcus "George" Bai (born 11 October 1972) is a Papua New Guinean former professional rugby league footballer who played in the 1990s and 2000s.

Having won the 1999 Premiership, Melbourne Storm contested in the 2000 World Club Challenge against Super League Champions St. Helens, with Bai playing on the wing and scoring a try in the victory.

That year for the Melbourne Storm, Bai was hampered by injuries, including being cut on his right arm by the steel advertising boards.

[8][4][9] After displaying his ability with some impressive performances for Melbourne Storm, Bai transferred to English Super League club the Leeds Rhinos.

He announced his arrival at the club in the best possible fashion, by scoring a hat-trick on his full début in front of the Leeds Rhinos home crowd.

As Super League IX champions, the Rhinos faced 2004 NRL season premiers, the Bulldogs in the 2005 World Club Challenge.

Bai played for Leeds in the 2005 Challenge Cup Final on the wing and scored a try in their loss against Hull FC.

Bai signed a new one-year contract extension with Bradford Bulls in September 2006, but changed his mind a few months later and announced his retirement from the sport in December 2006.